Full-link quantitative online self-checking circuit of capacitive transducer receiving system

Abstract

The invention provides a capacitive transducer receiving system full-link quantitative online self-checking circuit, which comprises a self-checking input signal source V1, a first resistor R1, a first switch S1, a first transformer T1 and a capacitive transducer receiving system to be tested, and is characterized in that the positive electrode of the self-checking input signal source V1 is connected with the first resistor R1; the negative electrode is connected with the first channel input end of the first switch S1, the second channel input end of the first switch S1 is connected with the other end of the first resistor R1, and the first channel second output end and the second channel second output end of the first switch S1 are connected with the primary side of the first transformer T1; and the secondary side of the first transformer T1 is connected in parallel with the input end of the capacitive transducer receiving system to be tested. According to the method, the full-link performance including the static parameters of the capacitive transducer can be detected on line, the problem that the static working parameters of the capacitive transducer cannot be quantitatively and accurately measured on line in the prior art is solved, and the accuracy and comprehensiveness of detection are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuits, and in particular to a full-link quantitative online self-test circuit for a capacitive transducer receiving system. Background Art

[0002] As an important measurement method, the performance of the capacitive transducer receiving system is directly related to the accuracy of the measurement results. Especially in the field of underwater acoustics, some receiving systems install the transducer on the hull or bottom of the ship. Such an installation position makes it difficult to perform offline detection of the transducer, so online detection technology is particularly important.

[0003] There are many shortcomings in the existing online detection methods of capacitive receiving systems. One method is to add a detection circuit after the capacitive transducer preamplifier circuit. Although this method can effectively reduce the impact of the self-test circuit on the performance of the receiving system, it cannot achieve full-link detection of the entire receiving system including the transducer. Another method is to collect the noise of the capacitive transducer array under the static working state, perform multi-channel comparison, and make an estimated judgment based on the difference between the channels. Although this method is simple and does not require the addition of a self-test circuit, it cannot quantitatively detect the static parameters of the capacitive transducer receiving system, and is mainly used in multi-array systems. It is not applicable to receiving systems that only contain a single or a small number of capacitive transducers.

[0004] Therefore, in view of the problems existing in the prior art, it is urgent to develop a full-link quantitative online self-test circuit that can be applied to a single-channel capacitive transducer receiving system. Summary of the invention

[0005] In view of the defects in the prior art, an object of the present invention is to provide a full-link quantitative online self-test circuit for a capacitive transducer receiving system.

[0006] According to the present invention, a full-link quantitative online self-test circuit of a capacitive transducer receiving system is provided, which is characterized in that it includes: a self-test input signal source V1, a first resistor R1, a first switch S1, a first transformer T1 and a capacitive transducer receiving system to be tested, wherein the positive electrode of the self-test input signal source V1 is connected to the first resistor R1, the negative electrode is connected to the first channel input end of the first switch S1, the second channel input end of the first switch S1 is connected to the other end of the first resistor R1, the first channel second output end and the second channel second output end of the first switch S1 are connected to the primary side of the first transformer T1, and the secondary side of the first transformer T1 is connected in parallel with the input end of the capacitive transducer receiving system to be tested.

[0007] Preferably, the first resistor R1 is used to limit the current of the self-test signal source V1 and increase the load of the self-test circuit, thereby reducing the limitation on the driving capability of the self-test signal source V1.

[0008] Preferably, the first switch S1 controls the input of the self-test input signal, and the capacitive transducer receiving system is switched between the online self-test mode and the normal measurement mode by switching the state of the first switch S1.

[0009] Preferably, the first transformer T1 applies the self-test input signal to both ends of the capacitive transducer to be tested according to a preset ratio to perform signal transmission and conversion.

[0010] Preferably, the self-test circuit does not change all subsequent circuits when the capacitive transducer works normally, and only adds an online self-test circuit to the input end of the capacitive transducer to be tested.

[0011] Preferably, the first resistor R1, the leakage inductance of the first transformer T1 and the static parameters of the capacitive transducer to be tested form an LCR series circuit, divide the self-test input signal, collect the divided voltage value using the post-processing circuit of the normal operation of the capacitive transducer, and calculate the static parameters of the capacitive transducer to be tested.

[0012] Preferably, the post-processing circuit includes a conditioning circuit, an ADC acquisition and signal processing module, which is used to acquire the voltage division value and perform signal processing to calculate the static parameters of the capacitive transducer to be measured.

[0013] Preferably, it further comprises a control unit, which is connected to the first switch S1 and is used to control the switching of the first switch S1 to automatically switch the capacitive transducer receiving system between the online self-test mode and the normal measurement mode.

[0014] Preferably, the working mode of the capacitive transducer and its post-processing circuit is switched by controlling the first switch S1: when the first switch S1 inputs the self-test input signal, the capacitive transducer and its post-processing circuit are in an online self-test mode; when the first switch S1 disconnects the self-test input signal, the capacitive transducer and its post-processing circuit are in a normal measurement mode.

[0015] Preferably, the self-test input signal source V1 is a programmable DAC signal source, which can adjust the frequency and amplitude parameters of the signal as needed to meet the detection requirements of different capacitive transducers.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention provides a full-link quantitative online self-test circuit for a capacitive transducer receiving system, which can realize online detection of full-link performance including static parameters of the capacitive transducer, solves the problem in the prior art that the static working parameters of the capacitive transducer cannot be accurately measured online, and improves the accuracy and comprehensiveness of the detection;

[0018] 2. The self-test circuit of the present invention has a simple structure. It is composed of basic components such as a self-test signal source, a resistor, a switch, a transformer and a capacitive transducer to be tested. It is easy to implement and integrate. By controlling the switching of the switch, the working mode of the capacitive transducer and its post-processing circuit can be conveniently switched, and the flexible switching between online self-test and normal measurement can be realized, thereby enhancing the controllability of the system.

[0019] 3. The present invention utilizes a voltage divider circuit composed of a series circuit, a transformer leakage inductance value and the static parameters of a capacitive transducer to divide the self-test input signal, and collects and calculates the voltage divider value through a post-processing circuit, thereby obtaining the static parameters of the capacitive transducer to be tested. It has high detection accuracy, and since it does not change all subsequent circuits during normal operation of the capacitive transducer, it has little impact on the capacitive transducer and its post-processing circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0021] Figure 1 An online self-test circuit diagram of a capacitive transducer provided by an embodiment of the present invention;

[0022] Figure 2 A block diagram of an online self-test system for a capacitive transducer provided in an embodiment of the present invention;

[0023] Figure 3 This is an equivalent circuit diagram of an online self-test of a capacitive transducer provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0025] Embodiment 1:

[0026] Reference Figure 1 and Figure 2According to the present invention, a full-link quantitative online self-test circuit of a capacitive transducer receiving system is provided, which is characterized by comprising: a self-test input signal source V1, a first resistor R1, a first switch S1, a first transformer T1 and a capacitive transducer receiving system to be tested, wherein the positive electrode of the self-test input signal source V1 is connected to the first resistor R1, the negative electrode is connected to the first channel input end of the first switch S1, the second channel input end of the first switch S1 is connected to the other end of the first resistor R1, the first channel second output end and the second channel second output end of the first switch S1 are connected to the primary side of the first transformer T1, and the secondary side of the first transformer T1 is connected in parallel with the input end of the capacitive transducer receiving system to be tested.

[0027] The first resistor R1 is used to limit the current of the self-test signal source V1 and increase the load of the self-test circuit, thereby reducing the limitation on the driving ability of the self-test signal source V1; the first switch S1 controls the input of the self-test input signal, and switches the capacitive transducer receiving system between the online self-test mode and the normal measurement mode by switching the state of the first switch S1; the first transformer T1 applies the self-test input signal to both ends of the capacitive transducer to be tested according to a preset ratio to transmit and transform the signal; the self-test circuit does not change all subsequent circuits when the capacitive transducer is working normally, and only adds the online self-test circuit to the input end of the capacitive transducer to be tested; the first resistor R1, the leakage inductance of the first transformer T1 and the static parameters of the capacitive transducer to be tested form an LCR series circuit, divide the self-test input signal, use the post-processing circuit of the capacitive transducer to normally work to collect the divided voltage value, and calculate the static parameters of the capacitive transducer to be tested; the post-processing circuit includes a conditioning circuit, an ADC acquisition and signal processing module, which is used to collect the divided voltage value and perform signal processing to calculate the static parameters of the capacitive transducer to be tested.

[0028] The full-link quantitative online self-test circuit of the capacitive transducer receiving system also includes a control unit, which is connected to the first switch S1 and is used to control the switching of the first switch S1 to automatically switch the capacitive transducer receiving system between the online self-test mode and the normal measurement mode; by controlling the first switch S1, the working mode of the capacitive transducer and its post-processing circuit is switched: when the first switch S1 inputs the self-test input signal, the capacitive transducer and its post-processing circuit are in the online self-test mode; when the first switch S1 disconnects the self-test input signal, the capacitive transducer and its post-processing circuit are in the normal measurement mode; the self-test input signal source V1 is a programmable DAC signal source, which can adjust the frequency and amplitude parameters of the signal as needed to meet the detection requirements of different capacitive transducers.

[0029] Embodiment 2:

[0030] The technical problem solved by the present invention is the problem of full-link quantitative online fault detection of a capacitive transducer receiving system. In order to realize online quantitative detection of the static parameters of a capacitive transducer and its post-processing circuit, the present invention provides a full-link quantitative online self-test circuit for a capacitive transducer receiving system. The purpose of the present invention is to solve the problem in the prior art that the static working parameters of a capacitive transducer cannot be accurately measured online, and to provide a full-link quantitative online self-test circuit for a capacitive transducer receiving system. The circuit makes full use of the capacitive transducer and its post-processing circuit, and can realize full-link performance online detection including the static parameters of the capacitive transducer. The scheme has the characteristics of simple structure, strong controllability, high detection accuracy, and little impact on the capacitive transducer and its post-processing circuit.

[0031] In a preferred embodiment of the present invention, a capacitive transducer online self-test circuit is provided. It should be noted that the present invention is not limited to any type of piezoelectric ceramic transducer.

[0032] like Figure 1 As shown, the capacitive transducer receiving system has a full-link quantitative online self-test circuit, a self-test signal source (V1), a first resistor (R1), a first switch (S1), a first transformer (T1) and a capacitive transducer to be tested. One end of the self-test input signal (V1) is connected to the first resistor (R1), and the other end is connected to the first channel input end of the first switch (S1), the second channel input end of the first switch (S1) is connected to the other end of the first resistor (R1), the first channel second output end of the first switch (S1) and the second channel second output end of the first transformer (T1) are connected to the primary side, the first channel first output end of the first switch (S1) and the second channel first output end are suspended, and the secondary side of the first transformer (T1) is connected in parallel with the input end of the capacitive transducer receiving system to be tested.

[0033] like Figure 1 The first switch (S1) shown controls the input of the self-test input signal. Specifically, the first switch (S1) can be implemented by an analog switch or a relay. The self-test input signal source (V1) can be generated by controlling a DAC or by placing a signal source. The first resistor (R1) can be selected to be 1 kΩ.

[0034] like Figure 1 The first transformer (T1) shown applies the self-test input signal to the input ends of the receiving system of the capacitive transducer to be tested according to a certain ratio. Specifically, the first transformer (T1) can be a 1:1 transformer.

[0035] like Figure 2As shown, the self-test circuit does not change all subsequent circuits when the capacitive transducer works normally, but only adds the online self-test circuit to the input end of the receiving system of the capacitive transducer to be tested; the post-processing circuit of the capacitive transducer may include a conditioning circuit, an ADC acquisition and signal processing module, and may also be composed of other circuits.

[0036] like Figure 1 and Figure 3 As shown, the first resistor (R1), the leakage inductance value of the first transformer (T1) and the static parameters of the capacitive transducer to be tested form an LCR series circuit, and the self-test input signal is divided, wherein V2=Zc / (R+ZL+Zc)*V1, where the capacitive transducer can be equivalent using a CpG model, ZL is the impedance generated by the leakage inductance of the first transformer, and when the first transformer (T1) is selected as a 1:1 transformer, V2 is the input voltage of the capacitive transducer post-processing circuit. The voltage division value is collected by the capacitive transducer post-processing circuit, and the static parameters of the capacitive transducer to be tested can be calculated to determine whether the capacitive transducer to be tested is working normally.

[0037] Specifically, Vout = V2*A; V2 = Zc / (R+ZL+Zc)*V1; ZL = wL; ZR = R; w = 2*pi*f. When V1, A, f, R, and L are known, Zc can be calculated based on the Vout obtained by the receiving system. When the Zc value deviates from the true value by a certain value according to the actual situation, it can be determined that the receiving system has failed and should be repaired in time.

[0038] like Figure 1 and Figure 2 As shown, the capacitive transducer online self-test circuit can perform online detection of the static parameters of the capacitive transducer and the entire link of transducer post-processing.

[0039] To summarize, the present invention utilizes a series circuit, a transformer leakage inductance and the static parameters of a capacitive transducer to form a voltage divider circuit, divides the self-test input signal, and uses a capacitive transducer post-processing circuit to collect and calculate the voltage divider value, thereby obtaining the static parameters of the capacitive transducer to be tested, thereby realizing full-link online detection of the capacitive transducer and the post-processing circuit.

[0040] Those skilled in the art may understand this embodiment as a more specific description of Embodiment 1.

[0041] Those skilled in the art know that, in addition to realizing the system and its various devices, modules, and units provided by the present invention in a purely computer-readable program code, it is entirely possible to realize the same functions in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers by logically programming the method steps. Therefore, the system and its various devices, modules, and units provided by the present invention can be considered as a hardware component, and the devices, modules, and units included therein for realizing various functions can also be regarded as structures within the hardware component; the devices, modules, and units for realizing various functions can also be regarded as both software modules for realizing the method and structures within the hardware component.

[0042] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A full-link quantitative online self-test circuit for a capacitive transducer receiving system, characterized in that: include: A self-test input signal source V1, a first resistor R1, a first switch S1, a first transformer T1 and a capacitive transducer receiving system to be tested, wherein the positive electrode of the self-test input signal source V1 is connected to the first resistor R1, the negative electrode is connected to the first channel input end of the first switch S1, the second channel input end of the first switch S1 is connected to the other end of the first resistor R1, the first channel second output end and the second channel second output end of the first switch S1 are connected to the primary side of the first transformer T1, and the secondary side of the first transformer T1 is connected in parallel to the input end of the capacitive transducer receiving system to be tested.

2. The full-link quantitative online self-test circuit of the capacitive transducer receiving system according to claim 1, characterized in that: The first resistor R1 is used to limit the current of the self-test signal source V1 and increase the load of the self-test circuit, thereby reducing the limitation on the driving capability of the self-test signal source V1.

3. The full-link quantitative online self-test circuit of the capacitive transducer receiving system according to claim 1, characterized in that: The first switch S1 controls the input of the self-test input signal, and the capacitive transducer receiving system is switched between the online self-test mode and the normal measurement mode by switching the state of the first switch S1.

4. The full-link quantitative online self-test circuit of the capacitive transducer receiving system according to claim 1, characterized in that: The first transformer T1 applies the self-test input signal to both ends of the capacitive transducer to be tested according to a preset ratio to transmit and transform the signal.

5. The full-link quantitative online self-test circuit of the capacitive transducer receiving system according to claim 1, characterized in that: The self-test circuit does not change all subsequent circuits when the capacitive transducer works normally, and only adds an online self-test circuit to the input end of the capacitive transducer to be tested.

6. The full-link quantitative online self-test circuit of the capacitive transducer receiving system according to claim 1, characterized in that: The first resistor R1, the leakage inductance of the first transformer T1 and the static parameters of the capacitive transducer to be tested form an LCR series circuit, which divides the self-test input signal, collects the divided voltage value using the post-processing circuit of the normal working state of the capacitive transducer, and calculates the static parameters of the capacitive transducer to be tested.

7. The full-link quantitative online self-test circuit of the capacitive transducer receiving system according to claim 6, characterized in that: The post-processing circuit includes a conditioning circuit, an ADC acquisition and signal processing module, which is used to acquire the voltage division value and perform signal processing to calculate the static parameters of the capacitive transducer to be tested.

8. The full-link quantitative online self-test circuit of the capacitive transducer receiving system according to claim 1, characterized in that: It also includes a control unit, which is connected to the first switch S1 and is used to control the switching of the first switch S1 to automatically switch the capacitive transducer receiving system between the online self-test mode and the normal measurement mode.

9. The full-link quantitative online self-test circuit of the capacitive transducer receiving system according to claim 8, characterized in that: By controlling the first switch S1, the working mode of the capacitive transducer and its post-processing circuit is switched: when the first switch S1 inputs the self-test input signal, the capacitive transducer and its post-processing circuit are in the online self-test mode; when the first switch S1 disconnects the self-test input signal, the capacitive transducer and its post-processing circuit are in the normal measurement mode.

10. The full-link quantitative online self-test circuit of the capacitive transducer receiving system according to claim 1, characterized in that: The self-test input signal source V1 is a programmable DAC signal source, which can adjust the frequency and amplitude parameters of the signal as needed to meet the detection requirements of different capacitive transducers.

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